Arc-lamp.



H. FRIEDRICHSEN.

ARG LAMP.

APPLloATIoN FILED JULY 10,1908.

Patented May 9, 1911.

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narran4 spaans Parana ernten. l

HEINRICH FRIEDRICHSEN, 0F BERLIN, GERMNY, ASSGNOR TO GENERAL ELECTRIC 'I COMNY, A CORPORATION 0F NEW YORK.

. Aaomnr.

Specification of Letters Patent.

Patented May a, rari.

Application filed July 10, i905. Serial No. 443,000.

lower ends of the yelectrodes ordinarily pass through a comparatively wide opening in a shield which is designed to protect the regulating mechanism of thelamp from access thereto of the vapors produced at the arc. This shieldis also sometimes made of highly refractory material, and it is usually cup-shaped, s o as to prevent admission of air to the arc. It the shield 1s formed of refractory material it is ordiof this arc-establishing movement of either one or both electrodes, it is necessary to make the opening in the shield or economizer rather' wide, and the consequence of this is that the fumes or vapors arising from the arc pass upwardly through this opening and deposit in a iiiocculent form uponthe regulating mechanism. p

' My invention hasy -for its object a construcing of the'shield or economizer is prevented. In accordance with my invention this result is secured by establishing the'arc by a separating movement of one or both electrodes in a direction substantially at right angles to the normal plane of the electrodes, Whichis any plane 'defined by the point vof contact and a separate pointin each electrode, instead of by a separating movement within that plane. In one form of apparatus I provide a Vcover for the opening in the shield, which cover is formed in two parts, one movable with reference to the other and with their edges in contact; and this relation is maintained at allj times, so that the opening inthe shield is not uncovered. when the are is established. All this will more fully appear from the following detailed description with reference to the accompanying drawing, in which one form which my invention may assume is represented as follows :'l

Figure l is a plan view of two converging electrodes guided in accordance with my invention, and showing the electrodes sepa-v rated ior the establishment of an aref; Fig. 2 1s an elevation of the same parte, with the shield or economizer in vertical section; Fig.

3 isl a plan view showingv the electrodes viewed at right angles to the arrangement represented'in Figs. l and 2, but with the electrodes in contact; and Fig. l is a sectional elevation similar to Fig. 2, with the electrodes viewed as in Fig. 3.

Like numerals of reference indicate likev parts throughout the drawing.

The shield or4 economizer l is represented as formed with a flange 2 by which it may be secured in the lamp in any ,convenient manner, and this shield, which is here shown as a cylindrical cup, has formed in its top a wide circular opening 3, indicated in Figs. l and-3 in dotted lines. This opening is covered by two plates 4 and 5,-one of which, 4, is formed of a flat rectangular piece 6 of insulating material, one edge of which has a flange 7, anden top Aof this plate 6 is a metal plate 8, and the two plates together are secured in position so as to coverhalf the circular opening 3; they are secured in position by screws 9, or in any other appropriate manner. The other half of the opening 3 is covered by the plate 5, which .is or may be of metal, and from the top of the shield l. rises a pin 10 which takes into a slot 11 in the plate 5, whereby this plate may be guided in longitudinal movements with its inner edge in contact with the flange 7 Aof the insulating 'plate 6. In order to effect such movement, one edge of the plate 5 is formed into a hook or loop 5', which may either serve as a ,hold for hand operation, orto which the arc-establishing mechanism of the lamp may be suitably connected. As indicated in the drawing, a hole i overlap, so -that the axes of the two elec-- anni trodes are not strictly in one plane. This is indicated in Figs. 3 and 4, which show the relation of parts when the electrodes are in contact.

It will be seen from the foregoing description that with the construction shown the are is established by sliding the plate 5 longitudinally, with its inner edge in contact with the flange 7, and this can be done either by hand or by suitable mechanism applied to the hook or loop 5.` Figs. l and f2 represent the relation of parts when the electrodes have been thus separated, and it is evident that the movement of separation is at right angles to the normal plane delined by the point of contact and any two separate points ol the electrodes. It will also be seen that, no matter whether the electrodes are in contact or are separated for the establishment out an arc, the central opening 3 in the shield or cconomizer l always remains covered by the two plates 4 and 5, so that no arc fumes can pass `through that opening. f

My invention is not limited to the use of the identical mechanism and arrangement ot' parts hereinbetore described and is not limited to the use of any particular kind of electrodes, although the invention is more particularly intended for use in connection with electrodes which give a flaming or luminous are, since these are the electrodes from which fumes arise, which are liable to deteriorate the regulating mechamsm.

Having now fully described my invention, I claim and desire to secure by Letters Patent:

1. In an are lamp, the combination of a set of downwardly converging electrodes, a

shield or economizer having an opening in the top through which the electrodes project, a cover for the opening, comprising two parts tted edgewise against each other and extending longitudinally over the opening, cach part having a perforation for the passage of one electrode and one'of said parts being movable edgewise with reference to the other, and means for moving the movable electrode by the movable part of the cover at an angle to the normal plane of the electrodes to strike the arc, whereby the shield opening remains covered. v 2. In an are lamp, the combination of a set ol" downwardly.converging electrodes, a shield or eeonomizer having a top opening through which the electrodes project, two plates in cdgewise contact covering the shield opening, each having a perforation for the passage of the electrode, and means for moving one ot' the plates longitudinally and thereby one ot the electrodes laterally to strike the are at an angle to the normal plane ot the electrodes.

In witness whereof, I have hereunto set my hand this 19th day of June 1908.

' HIGINRlCH FRIEDRICHSEN.

lVitnesscs:

EL-Isn Fmnmonsmv,

MAX ABEL. 

